JEE Main 2019 — Statistics Question with Solution
JEE Main 2019 (11 Jan Shift 1)
Question
The outcome of each of 30 items was observed; 10 items
gave an outcome each, 10 items gave outcome
each and the remaining 10 items gave outcome each.
If the variance of this outcome data is then equals:
Choose an option
Show full solutionCorrect option: D
Correct answer
D
Step-by-step explanation
Outcomes are times, ,
times, times
Variance of the outcomes is,
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This is a previous-year question from JEE Main 2019, covering the Statistics chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.